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Preparation method of high fluorescence efficiency Cs2AgxNa1-xInncl6 dual-layer perovskite

A double-layer perovskite, high-efficiency technology, applied in chemical instruments and methods, luminescent materials, nanotechnology for materials and surface science, etc. Fluorescence yield, simple operation effect

Inactive Publication Date: 2019-05-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the sample is obtained, it needs to be further washed and dried, and it is difficult to realize the industrialization of the function
[0005] In summary, the existing + Alloying and Bi 3+ Trace doping of lead-free double perovskite Cs 2 AgInCl 6 The method has certain limitations, there are unresolved problems and defects, and the technology needs to be innovated and improved

Method used

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  • Preparation method of high fluorescence efficiency Cs2AgxNa1-xInncl6 dual-layer perovskite
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  • Preparation method of high fluorescence efficiency Cs2AgxNa1-xInncl6 dual-layer perovskite

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Experimental program
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Effect test

Embodiment 1

[0021] Put 1mmol indium chloride, 2mmol cesium chloride, 0.4mmol sodium chloride, 0.9mmol silver chloride and 25 agate balls with a diameter of 6mm into a 25ml agate jar, adjust the AC frequency of the ball mill to 40Hz, and the speed at this time is 1200rad / min, mechanically milled for 1.5 hours, the mixture gradually hardened from a fluffy white powder and adhered to the wall of the agate jar, then became soft again, and finally became a fluffy powder again to obtain Cs 2 Ag 0.6 Na 0.4 InCl 6 Double-layer perovskite, then add 0.005mmol of bismuth chloride to it, continue to grind for 5 minutes, bismuth chloride is evenly dispersed in the system, at this time, irradiate with a 305nm ultraviolet lamp, it is found that the fluorescence brightness of the product does not continue to increase, and the The resulting product was washed twice with ethanol to remove unreacted cesium chloride and indium chloride, and then dried in a vacuum oven at 60° C. for two hours. The product w...

Embodiment 2

[0023] Change the consumption of the sodium chloride in embodiment 1 into 0.1mmol, 0.2mmol, 0.3mmol, 0.5mmol, 0.6mmol, 0.7mmol, 0.8mmol, 0.9mmol respectively by 0.4mmol and keep the content of sodium chloride and silver chloride simultaneously The total amount of moles is 1mmol constant, other conditions and steps are constant, and the fluorescent quantum efficiency of the product obtained from the consumption of different sodium chloride is as follows: Figure 4 As shown, the fluorescence efficiency of each product is 25.2%, 43.5%, 64.2%, 88.2%, 73.5%, 48.2%, 27.3%, 16.3%, respectively, Figure 5 The XRD patterns of the products obtained with some representative sodium chloride dosages are given.

Embodiment 3

[0025] The amount of sodium chloride is 0.5mmol, and the temperature after the final drying is changed from 60°C to 180°C, 240°C, and 350°C respectively, and the fluorescence quantum efficiencies of the products obtained at different temperatures are 88.7%, 90.2%, and 88.3% respectively. %. It shows that the heat treatment at 180~350℃ helps to improve the fluorescence yield of the product.

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Abstract

The invention relates to a preparation method of high fluorescence efficiency Cs2AgxNa1-xInncl6 dual-layer perovskite and belongs to the technical field of semiconductor nanomaterial preparation. Themethod comprises the steps that firstly, caesium chloride, sodium chloride, silver chloride and indium chloride are mixed and ground, the mixture is gradually hardened from fluffy white powder and isattached to a container wall, and then the powder is softened and continues to be ground until the mixture becomes fluffy white powder again; then, bismuth chloride is added for continuous grinding, and the obtained product is cleaned through ethyl alcohol and dried for 2 hours at the vacuum condition of 60-350 DEG C so as to obtain the high fluorescence efficiency Cs2AgxNa1-xInncl6 dual-layer perovskite. According to the method, Na+ alloying and Bi3+ trace doping of Cs2AgInC16 are achieved through mechanical grinding, and the fluorescence yield of the perovskite is greatly increased; meanwhile, the method has the advantages that the operation is simple, the method is simple, and industrial production is easily achieved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, in particular to a high fluorescence efficiency Cs 2 Ag x Na 1- x Preparation method of InCl6 lead-free double-layer perovskite. Background technique [0002] Lighting is ubiquitous in human society, and consumes one-fifth of the total electricity consumption of all human beings. Compared with traditional lighting, the semiconductor lighting technology based on GaN-based light-emitting diodes to excite phosphors has too much blue light component, which is easy to cause irreversible damage to the human eye, especially the retina of children, which is the so-called "blue harm"; at the same time, most fluorescent materials rely on Strategic rare earth materials are used as raw materials. Therefore, it is necessary to develop a new generation of new single-matrix white light phosphors to avoid blue pollution and the use of rare earth elements to achieve green light...

Claims

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Application Information

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IPC IPC(8): C09K11/62B82Y30/00B82Y40/00
Inventor 解仁国张资序汪大洋杨文胜
Owner JILIN UNIV
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